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    <title>Document</title>
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    <script>
        var promise = new Promise((resolve,reject)=>{
            resolve(100)
        });
        var p1 = promise.then((value)=>{
            console.log(value)
            return p1
        },()=>{

        })
        p1.then((value)=>{},(reason)=>{
            console.log(reason.message) // Chaining cycle detected for promise #<Promise> 打印出控制台捕捉到的错误信息
        })
        // 7. then的参数
        promise
            .then()
            .then()
            .then(function(value){
                console.log(value)
            })
    </script>
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